<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            width:400px;
            height: 200px;
            border:1px solid red;
        }
    </style>
    <script src="www/js/jquery-3.2.0.min.js"></script>
    <script>
        $(()=>{ for(let i=0;i<5;i++){
            $(`<div id="aa"></div>`).appendTo('#body')
            for(let j=0;j<3;j++){
                $(`<p>111111111111</p>`).appendTo('#aa')
            }


        }})

    </script>

</head>
<body id="body">

</body>
</html>